改性花生壳对水中铬铅的吸附作用

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1、农业环境科学学报2011,30(7):1404-1408JournalofAgro-EnvironmentScience改性花生壳对水中Cd2+和Pb2+的吸附研究11，2*1，21林芳芳，易筱筠，党志，郑刘春（1.华南理工大学环境科学与工程学院，广州510006；2.工业聚集区污染控制与生态修复教育部重点实验室，广州510006）摘要：用高锰酸钾对花生壳进行改性，制成改性花生壳吸附材料，并进一步就该吸附剂对水中重金属离子Pb2+、Cd2+的吸附去除性能进行了考察，结果表明，吸附在18h后基本达到平衡，吸附P

2、b2+和Cd2+最佳初始pH值分别为4.5和6.5，对Pb2+的吸附量最大达到104.75mg·g-1，对Cd2+的吸附量最大达到43.11mg·g-1。对Pb2+和Cd2+在该吸附剂上的竞争吸附研究结果表明，竞争吸附的干扰使得Cd2+的吸附量降低88.47%，Pb2+的吸附量降低20.80%，且Pb2+的吸附量为Cd2+的5~6倍，吸附剂对重金属离子的吸附选择顺序为Pb2+＞Cd2+。关键词：改性；花生壳；镉；铅；吸附；竞争吸附中图分类号：X703.1文献标志码：A文章编号：1672-2043(2011)0

3、7-1404-052+2+AdsorptionofCdandPbfromAqueousSolutionbyModifiedPeanutShellsLINFang-fang1,YIXiao-yun1,2,DANGZhi1,2,ZHENGLiu-chun1（1.CollegeofEnvironmentalScienceandEngineering,SouthChinaUniversityofTechnology,Guangzhou510006,China;2.TheKeyLabofPollutionControl

4、andEcosystemRestorationinIndustryClusters,MinistryofEducation,Guangzhou510006,China）Abstract：Theobjectiveofthisstudyistoseekforalowcostadsorbentmaterialtoremoveheavymetalionsfromaqueoussolution.Asahighvolumeagriculturalwaste,peanutshellsweremodifiedwithKMnO

5、4toproducebiomassadsorbent.Theadsorptioncapacityofthemodifiedad－sorbentstoremovecadmium（Ⅱ）andplumbum（Ⅱ）fromaqueoussolutionwereinvestigatedindifferentconditions.ResultsshowedthattheoptimuminitialsolutionpHvaluesforadsorptionwere4.5fortheleadand6.5forcadmium,

6、respectively.Theadsorptioncouldreachequilib－riuminabout18hours.Themaximumadsorptioncapacitywas104.75mg·g-1forPb2+and43.11mg·g-1forCd2+.Inaddition,thecompetitiveadsorptionofPb2+andCd2+onthemodifiedpeanutshellswasinvestigatedandtheresultsshowedtheadsorptionca

7、pacityofPb2+orCd2+wasmarkedlyrestrainedwiththecoexistingionsintheaqueoussolution.Comparingwiththesoleionadsorptionresults,thecompetitiveadsorp－tionhadmadeadsorptioncapacityofCd2+andPb2+fallabout88.47%and20.80%respectively.Inthecompetitiveadsorptiontest,thea

8、dsorp－tioncapacityofPb2+wasabout5~6timesofCd2+,whichshowedapreferenceforPb2+andindicatedtheadsorptionselectivitysequenceofthemodifiedpeanutshellsforthesetwoheavymetalsisPb2+>Cd2+.Keywords：modification;